Human Respiratory System Model, Half Life Size, with Head, Throat, and Lungs Ag Mechanics Demonstrates relative planetary motion on

Demonstrates relative planetary motion on a 13-inch three-dimensional solar system model with a 5

the triangular-cross-section blank giving classroom-grade dispersion for refraction and spectral-line experiments

and ungraduated design for liquid addition

dropping freely through the ring when cool but stopped by the ring once flame heating expands the ball

75 inches of plunger travel

Human Respiratory System Model, Half Life Size, with Head, Throat, and Lungs Ag Mechanics Demonstrates relative planetary motion onLongitudinal head throat lung cross section reveals the full air pathway from nostrils through trachea to alveoli at half life size for respiratory teaching.